package com.bwie;

import io.jsonwebtoken.Jwts;
import org.checkerframework.checker.units.qual.K;
import org.checkerframework.common.value.qual.StringVal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.RedisAccessor;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @description : TODO
 * @Author QiHainan
 * @Create 2025/7/18 14:35
 * @Version 1.0
 */
@Configuration
@Order(-1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().toString();

        //白名单
        if(url.contains("sendCode") || url.contains("login") || url.contains("regUser")){
            System.out.println("白名单："+url);
            return chain.filter(exchange);
        }

        //检查token
        String token = request.getHeaders().getFirst("token");
        Integer userId = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody()
                .get("userId", Integer.class);
        String tokenKey = "token-"+userId;
        String redisToken = stringRedisTemplate.opsForValue().get(tokenKey);
        if(redisToken == null){
            System.out.println("token为空："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        if(!redisToken.equals(token)){
            System.out.println("token错误："+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        
        //token续期
        stringRedisTemplate.expire(tokenKey,60, TimeUnit.MINUTES);

        System.out.println("放行");
        return chain.filter(exchange);
    }
}
